It's possible that your spouse's name is similar to a that of a person to whom American Express is unwilling to issue a card. I expect you will need to patiently work through this by telephone, during standard business hours. Chances are they will not tell you exactly what they are looking at due to privacy and security policies.

At this stage I am not sure I would invest the time unless you are confident you want to continue to use the SPG Business card after the end of July. However, you would likely encounter the same problem with any American Express business card.

Are you actually using the card for a business?